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Spin-Statistics Theorem Survives Test

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BERKELEY, Calif., June 28, 2010 — The most rigorous trials yet of a fundamental assumption about how particles behave on the atomic scale has been conducted at the University of California at Berkeley. "We tested one of the major theoretical pillars of quantum field theory, the spin-statistics theorem," said Damon English, a postdoctoral fellow in the University of UC Berkeley's Department of Physics, who led the experiment. "Essentially we were asking, are photons really perfect bosons?" A pump laser provides the energy for two dye lasers. The dye lasers are directed into a vacuum chamber where they interact with...Read full article

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    Published: June 2010
    Glossary
    electron
    A charged elementary particle of an atom; the term is most commonly used in reference to the negatively charged particle called a negatron. Its mass at rest is me = 9.109558 x 10-31 kg, its charge is 1.6021917 x 10-19 C, and its spin quantum number is 1/2. Its positive counterpart is called a positron, and possesses the same characteristics, except for the reversal of the charge.
    photon
    A quantum of electromagnetic energy of a single mode; i.e., a single wavelength, direction and polarization. As a unit of energy, each photon equals hn, h being Planck's constant and n, the frequency of the propagating electromagnetic wave. The momentum of the photon in the direction of propagation is hn/c, c being the speed of light.
    polarization
    Polarization refers to the orientation of oscillations in a transverse wave, such as light waves, radio waves, or other electromagnetic waves. In simpler terms, it describes the direction in which the electric field vector of a wave vibrates. Understanding polarization is important in various fields, including optics, telecommunications, and physics. Key points about polarization: Transverse waves: Polarization is a concept associated with transverse waves, where the oscillations occur...
    Americasbarium atomsBasic ScienceBerkeleyBose-EinsteinbosonDamon EnglishDavid DeMilleDmitry BudkerelectronexperimentalFermi-DiracFermionfermionicLawrence Livermore National LabNational Science FoundationPaul Diracphotonpolarizationquantum field theoryquantum statisticsRichard Feynmansingle-photon transitionspin-statistics theoremtheorytwo-photon transitionUniversity of CaliforniaValeriy YashchukLasers

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